Benchmark: Array split vs string substring substring

Script Preparation code:

var s1 = "sdfsfds(0,0,0,0,0,0,0,0,0,0,0)dsfs";

Tests:

Array.split
var n1 = s1.split("(")[1].split(")")[0];
Substring
var n1 = s1.substring(s1.indexOf("(")+1,s1.lastIndexOf(")"));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.split
Substring

Fastest: N/A

Slowest: N/A

Latest run results:

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

I'd be happy to explain the benchmark and its results.

**Benchmark Description**

The benchmark measures the performance of two approaches to extract a substring from a string: `Array.split()` and `Substring()`. The input string is defined in the "Script Preparation Code" section, which contains a string literal with a nested pattern (`(\`)`) that needs to be extracted. The test cases compare the execution times of these two approaches.

**Options Compared**

The two options compared are:

1. **Array.split()**: This method splits the input string into an array of substrings using a regular expression. In this case, it's used to extract the substring starting from the second open parenthesis `(`.
2. **Substring()**: This method extracts a specific substring from the original string using the `indexOf()` and `lastIndexOf()` methods.

**Pros and Cons**

* **Array.split():**
	+ Pros:
		- Can be more efficient for large input strings, as it avoids creating multiple temporary substrings.
		- More flexible, as it can handle nested patterns.
	+ Cons:
		- May have a higher overhead due to the regular expression processing.
		- Can be slower for small input strings or simple cases.
* **Substring():**
	+ Pros:
		- Typically faster and more lightweight than `Array.split()`.
		- Easier to understand and implement, especially for simple cases.
	+ Cons:
		- May create multiple temporary substrings, which can increase memory usage.
		- Less flexible than `Array.split()`.

**Library Usage**

Neither of the options uses a dedicated library. However, it's worth noting that both methods rely on internal JavaScript functions and data structures.

**Special JS Features or Syntax**

There are no special JavaScript features or syntax used in this benchmark.

**Other Considerations**

* **Cache**: The benchmark result might be influenced by cache effects, especially if the input string is repeated. However, MeasureThat.net likely optimizes for this case.
* **Platform and Browser Effects**: The benchmark result might also depend on the platform (in this case, Linux) and browser used (in this case, Chrome 105).

**Alternatives**

Other alternatives to `Array.split()` and `Substring()` could include:

1. Using a dedicated library like `regexp` or `lodash.string`.
2. Implementing a custom string extraction function using native JavaScript methods.
3. Using a different approach, such as parsing the input string into an abstract syntax tree (AST) and then extracting the desired substring.

Keep in mind that these alternatives might not be relevant to this specific benchmark or use case.

Related benchmarks:

Array split vs string substring substring (version: 0)

Comparing performance of: Array.split vs Substring

Created: 3 years ago by: Guest

Jump to the latest result

Array.split

Substring

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):